Pneumatic tool.



C. H. HAESELER.

PNEUMATIC TOOL.

APPDLICATION FILED MAR. II. i916.

1,297,679, Patented Mar. 18. 1919 2 SHEETS-SHE-ET 2- ATTQRNEYS V UNYEED STATES PATENT @FFICE.

CHARLES H. HAESELER. OF PHILADELPHIA, PENNSYLVANIA.

PNEUMATIC TOOL.

Application filed March 11, 1916.

To all who: it may ("on/1cm.

lie it known that l, (maniacs ll. l'lansi-zLun, a citizen of the United States, residing in the city and county of Philadelphia, State of Pennsylvania, have invented a new and useful Pneumatic Tool. of which the foll wing is a specification.

My present invention relates to a. novel construction of a pnemnatic tool and more particulai ly to a pneumatic tool in which a reciprocating piston is employed to impact against the working tool.

My invention consists in its broad and generic scope of a novel pneumatic tool. where in the handle and the cylinder or piston casing are ctmstrueted in a novel manner, whereby they can be readily assembled and securely locked in assembled position, and wherein they may be readily taken apart when occasion requires it.

It further consists of a novel construction of handle having a tapered recess or chamher in its body portion, and a novel construction of a cylinder or casing having a. tapered portion to engage the walls of the recess or chamber in the handle.

It. further consists of novel means for locking the handle and casing in assembled position.

Other novel features of construction and advantage will hereinafter more clearly appear in the detailed description of my invention.

For the purpose of illustrating my invention, I have shown herein, a typical embodiment thereof which well illustrates the principles of the invent-ion, but it is of course to be understood that this embodiment is typical only and that the various instrumentalitics of which my invention. consists can be variously arranged and organized and that my invention is not. limited to the precise arrangement and organization of these instrumcntalities as herein shown and described.

Figure 1 represents a. longitudinal section of a pneumatic tool embodying my invention.

Fig. 2 represents section on line m-m of Fig. 1. i

Fig. 3 represents Section on line g 1 of Fig. 1.

Fig. 4 represents a section on line zz of Fig. 8.

Fig. 5 represents a side elevation of a locking bolt.

specification of Letters Patent. 7 ltltflllltll Mar. 18, 1919.

Serial No. 83.470.

tribution valve controlling the reciprocation of the piston and located in the handle .in a

chamber separate and distinct from the cylindcr in which the piston reciprocates Any desired type of distribution valve may be employed .and any desired type of throttle valve mechanism may be employed to control the introduction of motive fluid to the distribution valve.

As my present invention is particularly directed to the construction of the coiiper-' ating portions of the handle and cylinder, I will first describe such parts.

1 designates the handle of a pneumatic tool embodying my inventioinsaid handle being provided with the grasping portion 2 and with a sleeve 3, which is recessed to form a tapered socket 4 which extends throughout the greater part of the lengtl'i of the sleeve 3. 5 designates the barrel or easing, the inner end of which is provided with a. tapered portion 6, which is accurately machined to fit the corresponding tapered portion 4 in the handle, and the tapered portion 6 is of slightly less length than the tapered socket 4 in order to provide a space 7 between the ends of the tapered parts, so that any wear which n'iay occur on the tapered parts, due to their being separated from each other, for repairs to the cylinder or piston or other causes. will be taken up. The cylinder 5 is provided with a piston chamber 8 in which reciprocates a piston '9, which during its movement uncovers the ports 10 which communicate with exhaust passagesll, which latter communicate with the atmosphere through exhaust: ports 12. The passages 11 are drilled fron the rear end of the cylinder and are screw threaded tor a portion of their length. as indicated at 13.

The rear end of the sleeve 3 of the handle ltn 1 has holes 14 drilled through it, which are adapted to register with the passages 11 in the cylinder 5. 15 designates bolts adapted to pass through the holes 14 and the passages 11 and these bolts are provided with threaded ends to engage the corresponding threads 13 in the passages 11, and these bolts are prevented from unscrewing by means of lock washers 16, which consists of split rings, as will be apparent from Figs. 1 and 8. The passages 11 are screw threaded for a greater length than the length of the threaded' portion of-the locking bolt 15, in order that longer lockin bolts 17 may be employed in case the t reads 13 should become worn or stripped by frequent removal of the lockin bolt 15 or by undue strain placed upon them in tightening the handle with respect to the cylinder. In order to remove the handle, the locking bolts 15 are unscrewed and the piston 9 is pushed to the 'rear end of the piston chamber 8 until it abuts against the rear wall of the recess or chamber in the handle. A strikin bar or rod is inserted through the forwar end 18 of the cylinder, and through the opening 19,

until it abuts against the forward end of the piston 9, so that the handle can be disenga ed from the cylinder.

n the operation of the pneumatic tool, it will be understood by those skilled in the art that motive fluid enters through the inlet 20, passing by the throttle valve 21, and through the passage 22, into the chamber 23, thence through ports 2+ into the valve chamber 25, and from the valve chamber 25 through port 26 into the recess 27 in the cylinder 5 in rear of the piston 9, cansing the same tomove forwardly and impact against the working too]. As soon as the piston passes the ports 10, a slight compression of motive fluidat the forward end of the cylinder acting through the passage 28 and ports 29 causes the distribution valve 30 to be moved into the position seen in Fig. 8, whereupon live motive fluid passes through the port 3l.into the valve chamber'25 and therefrom through port 29 and passage 28 in front of the shoulder on the piston 9 and causes the same to be returned to its rear or initial position. The

exhaust of motive fluid takes place through the ports 10 and 12 and passages 11.

It Will be apparent from the foregoing that in accordance with my present invention, the cooperating parts of the cylinder and handle are provided with tapered portions in frictional engagementwith each other, and means are provided to lock the parts in-"their assembled position. My present invention is not confined to the particular type of pneumatic topl illustrated, but may be employed, as is apparent, in conjunction with other types of pneumatic tools of either the valve or valveless type,

wherein the handle and cylinder form separate parts.

In devices of this character, when employed for riveting, the barrel or cylinder of the tool is held by the left hand of the operator and if the exhaust port or ports are located at the central portion of the barrel it interferes with the proper handling of the tool and such ports would be liable to be covered by the hand of the operator. By utilizing the open end of; a passage for the fastening bolt, one is enabled to reduce to a minimum the number of passages in the cylinder of the tool and thereby eliminate the weakening of the cylinder which would otherwise follow.

It will alsov be apparent that my present invention is designed to be employed in conjunction with pneumatic hammers, Wherein the stroke of the piston is greater or less than its own length. I have preferred to illustrate the rear ehd of the cylinder as having a conical contour to cooperate with the corresponding conical contour of the wall in the chamber of the bodyportion or sleeve of the handle, but it will be apparent that other forms of tapers will be employed and still be within the spirit and scope of my invention.

It will now be apparent that I have devised a novel and useful pneumatic tool, which embodies the features of advantage enumerated as desirable in the statement of the invention and the above description, and while I have. in the present instance, shown and described a preferred embodiment thereof which will give in practice satisfactory and reliable results, it is to be understood that the same is susceptible of modification in various particulars Without departing from the spirit or scope of the invention or sacrificing any of its advantages;

said socket and having exhaust passages exten-ding in proximity to the rear end of the cylinder, and means engaging the handle and interlocking with the Walls of said passages to maintain the handle and cylinder in assembled position.

2. In a, pneumatic tool, a handle having a tapered socket, a cylinder having a tapered end to fr ictionally engage said socket and having exhaust passages extending in proximity to the end of the cylinder, and pro vided with a threaded portion, and bolts passing through said handle and into said passages and having threaded ends to engage the threaded portions of said passages.

3. In a pneumatic tool adapted to be manually supported, a handle having a grasping raezzovo said socket and tapered socket, cylinder having a tapered end to fit said socket and having a piston chamber with exhaust passagesv therefrom opening through the side wall of the cylinder, said extending 1n proximity to the rear end of the cylinder, bolts passing closing the outer ends.

through said handle, of passages, and interlocking with the Walls thereof, and apiston in said piston.

chamber, and said cvlinder having its for Ward end open, whereby a tool may be inserted through such. end to move the piston against the handle and disengage the handle from the cylinder.

5. In a wrtable pneumatic tool adapted to be manually supported, a handle having a grasping portion adapted to be manually held and providedwith a sleeve Whose rear end is closed by a portion integral therewith, said sleeve having an internal, tapered, conieal, unthreaded socket, the Wall of the latter divers; g5

the outer end of said sleeve, a pisc" having a tapered for locking from said integral portion forton cylinder provided with a piston chamber and having its rear end tapered'to frictio1i-' allycngage said socket-of said handle sleeve to form therewith a tapered joint, valve mechanism j contained in said sleeve, and ports controlled by said valve mechanism and extending thronghsaid tapered j ointfor the introduction and exhaust of motive fluid to opposite ends of said piston chamber.'.

In a portable pneumatic tool adapted to be manually held, a'handle comprising an integral member provided with a grasping portion to. be manually held and closed at its rear end and a sle'eve'open only at its forward end and having an internal,- tapered, nnthreaded, conical socket,- Whose greatest diameter is at its forward end, a cylinder having its rear end unthreaded and tapered to conform to the taper of said socket to frictionally engage the latter and form there with a tapered joint, a piston in said cylinder, valve mechanism contained in said handlesleeve, ports through said tapered joint.

common'to said'valve mechanism and cylinder and controlled. by said valve mechanism to alternately introduce motlve fluid to opvices common to said handle'an'd cylinder theniin frictional engagement. 7 CHARLES HAESELER. Witnesses: 1 v

FAIRBANKS,

C. D. MCVAY.

.posite ends of said cylinder toefi'ect the re- .ciproc'ations of-said piston, and fastening de- 

